I'm not that really familiar with the various PK models.
You may find what you want to know at http://tantal.kalashnikov.guns.ru/collimator.html
If not, contact Doug who reps TANTAL at firstname.lastname@example.org
and he will answer your questions. He has been ill so his reply may be delayed.
No Guns, no peace.
Know guns, know peace.
Lone Star Glockers #3236, Top Guns 357Sig Club #3226, Niner #2632, .40 S&W Club #2332, Kalashnikov Klub 11147, Wheelhouse #2357